What absorbs at 3625 cm⁻¹ in an FTIR spectrum?
A band near 3625 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Snel antwoord
A band near 3625 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Mogelijke functionele-groeptoewijzingen
| Functionele groep | Ondersteunende feiten | Geciteerde bronnen | Hoogste vertrouwen |
|---|---|---|---|
| Hydroxyl (O-H) | 5 | 5 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 0,9 |
| Silicon-oxygen (Si-O) | 1 | 1 | 0,8 |
Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.
Mogelijke materialen
| Materiaal | Ondersteunende pieken | Overlappende groepen | Geciteerde bronnen |
|---|---|---|---|
| clay | 3625, 1736, 2855 | Hydroxyl (O-H) | 1 |
Materialen worden alleen getoond wanneer dezelfde literatuurpool deze band en ten minste één extra karakteristieke piek ondersteunt.
Spectrumlogica
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3625 cm⁻¹ is usually not enough for material identification by itself.
Gebruik in de praktijk
Dit type query komt vaak voor bij polymeeridentificatie, screening van onbekende kunststoffen, probleemoplossing bij QC, verificatie van gerecycled materiaal en literatuurondersteunde beoordeling van piektoewijzing.
Veelgemaakte fouten
- Het behandelen van een enkele geïsoleerde band als bewijs van een materiaal zonder ten minste een of twee ondersteunende pieken te controleren.
- Overlap negeren: meerdere functionele groepen kunnen bijdragen rond hetzelfde golfgetal.
- Validatie overslaan wanneer additieven, mengsels, oxidatie of verontreiniging het spectrum kunnen verstoren.
Advies voor verificatie
Wanneer dubbelzinnigheid blijft bestaan, valideer de hypothese met DSC, GC-MS of TGA, vooral voor mengsels, gedegradeerde monsters en gevulde polymeren.
Literatuur achter deze toewijzingen
-
Hydroxyl (O-H) vertrouwen 1,0
“Interpretation and discussion 3625cm-1 O-H-stretching frequencies near the band.”
The nature of interlayering in clays from a podzol (Spodosol) from the Tatra Mountains, Poland DOI: 10.1016/j.geoderma.2010.10.013 -
Hydroxyl (O-H) vertrouwen 1,0
“As shown in the clay spectra of RC, cm-1, NaC and OC, there are absorption bands at the frequencies 3626, 3629, and 3625 which refer to the stretching vibrations of the (O-H) bonds in Al-OHs, respectively, and”
Enhanced Coating Protection of C-Steel Using Polystyrene Clay Nanocomposite Impregnated with Inhibitors DOI: 10.3390/polym15020372 -
vertrouwen 1,0
“cm-1 Moreover, the appearance of a new band at 3625 was due to formation of Mn-O(H)-Si moieties (Scheme 1, Structure C), similar to acidic hydroxyl groups typical for zeolite materials.”
Incorporation of Mn into the vacant T-atom sites of a BEA zeolite as isolated, mononuclear Mn: FTIR, XPS, EPR and DR UV-Vis studies DOI: 10.1039/c6cp01713d -
Hydroxyl (O-H) vertrouwen 1,0
“The band at cm-1 Methylene blue (Sigma-Aldrich) was used in the adsorption study 3625 was assigned to the stretching vibration of structural OH 448cm-1were purification.”
Sodium montmorillonite/ureasil-poly(oxyethylene) nanocomposite as potential adsorbent of cationic dye DOI: 10.1016/j.clay.2017.11.009 -
Silanol (Si-OH) vertrouwen 1,0
“diatomite presented distinctive bands at 3625, 1633, 1433, 1043, 795 and 448 The cm-1 was due to the free silanol group (SiO-H) (Khraisheh et al., 2005;”
El Ouardi 等 - 2020 - An insight of enhanced natural material (calcined DOI: 10.1016/S0043-1354(01)00071-9 -
vertrouwen 1,0
“Fine particles of RHA, slag, and spherical particles Cem3,4,and5mortars.Thebandat3822cm-1 or3625cm-1 ofFAfillthesmallporesofZ-Cemandconsequentlyincrease may be due to the presence of calcium hydroxide.”
Karim 等 - 2015 - Development of a Zero-Cement Binder Using Slag, Fl DOI: 10.1155/2015/247065 -
Water (H2O) vertrouwen 1,0
“2355.9702 Atmospheric CO 2 3432.0896 Adsorbed water vibrations (H-O-H) 3624.6269 Inner OH groups, lying between the sheets of tetrahedral and octahedral units”
Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays DOI: 10.3390/nano12142332 -
Hydroxyl (O-H) vertrouwen 1,0
“the characteristic peak near 1535 in the spectrum 3 FTIR spectra of NHA, 3752 cm-1 and 3625 cm-1 are the stretching vibrations of -OH with”
Selective Adsorption of 2-Hydroxy-3-Naphthalene Hydroxamic Acid on the Surface of Bastnaesite and Calcite DOI: 10.3390/min12111341
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